Dynamo-electric machine



R. E. HELLMUND'AND J. V. DOBSON.

DYNANIO ELECTRIC MACHINE.

APPLICATION Vmio MAR. 20. |915. RENEWED MAR. 1.1919.

lzmnhd Oct. 14, 1919.

/izM/f/ ATTORNEY R. E. HELLMUND AND J. V. DOBSON.

DYNAMO ELECTRIC MACHINE. APPLlcmon msn mm. 2o. |915. nndswco mm. 1.1919.

2 SHEETS-SHEET 2.

INVENTOR .Pudo/f E. HQ//mund 6r `ffy/rg( l/ Dobson.

ATTORNEY Patented Oct. 14, 1919.

UNITED STATES PATENT OFFICE.

RUDOLF n. HELLMUND,

0F PITTSBURGH, AND JOHN V. DOBSON, OF WILKINSBURG,

PENNSYLVANIA, ABSIGNOBS T0 WESTINGIIOUBE ELECTRIC AND MANUFACTUR- ING COMPANY, A CORPURATION OF PENNSYLVANIA.

DYNAMO-ELEGTBIC MACHINE.

Bpectcation of Letters Patent.

Patented oet. 14, 1919.

lApplication illed March 20, 1915, Serial No. 15,800. Renewed March 1, 1919. Serial Ho. 280,142.

To all whom t may concern.'

Be it known that we, RUDOLF- E. HELL- MUN D, a subject of the German Empire, and a resident of Pittsburgh, in the county of Allegheny and State of Penns vania, and JOHN V. DoiisON, a citizen o the United `States, and a resident of Wilkinsbuig, in the county of Allegheny and State of ennsylvania, have invented a new and useful Improvement in Dynamo-Electric Machines, of which the following4 is a specification.

,Our invention relates toy d nemo-electric machines, and it has specia reference to machines of the type known as phase converters, such as are employed u on electric locomotives for the purpose o converting single-phase enery, which is received from the trolley distri uting system, into polyphase energy which is supplied to the polyphase driving-motors.

One of the objects of our invention is to provide a machine of the above-indicated character which shall be simple compact and durable in construction and light in weight, and the arrangement of parts of which shall be such as to minimize the cost of manufacture and assembly and shali also facilitate dismantling of the component elements vfor the purpose of replacement or repairs. I'

Another object of our invention is to provide a dynamo-electric machine of the inclosed type which shall be constructed and arranged to embody a ventilatin system by means of which a liberal and ree circulation of a cooling medium is maintained from the res ective ends of the machine inwardly through longitudinal Ventilating ducts in the lstator and rotor core members into an intermediate. Ventilating space between the complemented rotor and stator halfmem bers, from whence it is dischar ed, in a radial direction, in substantially t e central lane of the machine.

Another object of our` invention is to combine the phase converter with its starting motor in such manner as to economize material and space, lsubstantiall. reduce the weight and number of parte o the apparatus, as a whole, and, moreover, to provide an overhang starting motor upon the converter shaft, the stator and rotor parts of which may be independently removed.

ccording to our invention we provide a single unitary lower half frame member which serves, in common, for the phase converter and starting motor arts and which embodies co-axial semi-cylindrical seats of different diameters for receiving and supporting the stator core members of the converter and the starting motor. Co axial seats are also provided to receive a pair of bearing members which carry the shaft upon which the converter and starting motor rotors are mounted.

Both the stator andthe rotor core members of the phase converter comprise a pair "of complete laniinatedhalhunits which are disposed in side-'by-side relation and separated the one from the other to rovide a liberal intermediate space. The alf-units of the rotor and stator are rigidly fastened together tO constitute 4a unitary and self-contained structure, and the structure thus formed is handled, in assembling the machine, as a sin le member.

The lower hal -frame is provided with end inlet Ventilating openings and a central row of discharge openings which communicate with the s aces intermediate the core member units. hus, two separate and parallel paths of ventilatin medium through the respective core mem er units are provided,A ille plates being disposed intermediate the several core member units for the purpose of obviating back pressures and permitting free and independent circulating currents.

Moreover, in order to permit of ready over-hauling of the starting motor vthe overhung shaft upon which it is mounted.

Our invention may best he understood by reference to the accompanying drawings, m

rotor are positioned in' which Figure 1 is a view, partially in sideelevation and in section of a dynamo-electric machine embodying a phase converter and its starting motor constructed in accordance with our invention, certain arts being broken away for the sake of c ear-` structure shown comprises. a lower halfframe 1, a phase-converter stator 2, a phaseeonverter rotor 3, a startin -motor stator 4, a starting motor rotor 5, a s aft 6 and a plurality of bearin members 7 and 8.

The lower ha f-frame 1 comprises a main body portion 10 and an end projecting portion 11, the main portion 10 serving as the frame for the phase-converter parts, while the integral projecting portion 11 serves to support the starting motor elements. The main portion 10 of the lower half-frame 1 is rovided with a luralit of longitudinal y-disposed webs 3 whic together constitute a cylindrical seat 14 to receive the cylindrical stator-core member 2 of the phase converter. Moreover, end portions 15 and 16 of the frame 10 are rovided with co-axially related semi-cylin rical seats 17 and 18 upon which the bearing members 7 and 8 are positioned, being secured to said end portions by bolts 19.

The lower half-frame 1 is also provided with bottom end openings 20 and 21 through which a circulation ofventilating medium is introduced from any suitable source, while dischar e o enings 22 are provided in substantial y t e central plane of the frame 1 for the purpose of ermitting the discharge of Ventilating lluid.J

'A plurality of su porting lugs or feet 24 and 25 form mtegrafparts of-the lower halfframe 1 and may conveniently rest upon a plurality of supporting members 26 and 27 of any suitable form for the purpose of supporting the machine in position.

So far as the bearing members 7 and 8 are concerned, our invention is, of course, independent of the vstructural features thereof, and anywell-known form of device for rotatably supporting the shaft 6 may' be employe j The phase-converter stator 2 comprises a pair Voff halfmiiitsoland 31 thatlare 'of like construction, each comprising a pluralit of laminations 32 and end plates '33 an 34 that are disposed immediately adjacent the respective ends of the laminated core structures.I The laminations and end plates, referred to, are fastened together to constitute a. single and complete unit b means of rivets 35, and each core unit suc as det scribed, is provided with a plurality 'of longitudinal Ventilating ducts 36.

'lhe outer end-plates 33 are provided with upwardly projecting eyes 37 by means of which the stator may be conveniently removed from the supporting half-frame 1, while lthe inner end-plates 34 embody a plurality of inte ral projecting lugs 38 and radially dispose vanes 39, for a purpose t0 be hereinafter set forth. The lugs 38 cooperatively engage each other in abuttin relation to space the core half-units 30 an 31 apart. A plurality of tie-bolts or rods 40 project through suitable openings in the core half-units 30 and 31 for the purpose of clamping the units together to constitute a single and unitary r1 id structure that may be handled and assem led or dismantled conveniently. A baille plate 42 of annular form is interposed in the space intermediate the two core half-units 30 and 31 and is positioned by reason of its engagement with the radial vanes 39 as well as by the tiei bolts 40 which project through it.

The phase-converter stator 2, as just described, is seated upon the longitudinal webs 13 of the lower half-frame 1, which together Aform a semi-cylindrical seat therefor, and, in order to rigidly clamp the stator to the frame, said stator is provided with a lurality 'of oppositely-disposed longitudlnallyrejecting key-ways 45 which are located just above the upper surfaces 47 of side portions 48 of the lower half-frame 1. A plurality of keys 49 are inserted into the ey-ways 45 and are firmly clamped to the surfaces 47 of the frame 1 by means of bolts 50. The stator 2 is, of course, provided u on its inner eriphery with a plurality of s ots 52 in wltidliare disposed conductors 53201 the primary windings of the machine. Ines much vas the core half-units 30 and 31 are spaced apart, the conductors 53 bridge the gap between them and are exposed to the circulation of Ventilating medium, as will hereinafter beV explained.

The phase-converter rotor 3 comprises a pairfof half-units 60 and 61, each of which embodies a plurality of laminations 62, endplates 63 and 64 and rivets 65, or other suitable means for rigidly fastening the arts together to 'form a com let'e and sel -ccntalned unit. Each of t 6, rotor half-units.

60 and 61 is provided with longitudinal Ventilating ducts 66, and the inner end plates 64 embody rejecting annular portions 67 that are adapted for abutting engagement for the purpose of spacing the core half-units 60 and 61 a art. The endplates 64 also are provide with inte al radial vanesl68 between which a baille p ate 69 is positioned for the purpose ofA subdividin the intermediate space between the stator alf-unita 60 and 61 and obviating back pressures, as will hereinafter be more fully set forth. The rotor half-units-60 and 61 are rigidly clamped together by tie-bolts 70 to form a unitary structure which is keyed upon the shaft Y6 in the usual manner and may be removed therefrom as aY unlt,'1'f desired.V i

The periphery of the rotor 3 Vis provlded with a plurality of slots 71 for receiving conductors 72 of a squirrel-ca winding such as are commonly employed 1n dynamoelectric machines of the induction type. The conductors 72 are electrically connect to a .plurality of conductin end-rings 7 3, and said conductors bri ge the space between the rotor halfunits 60 and @6,1 and are directly exposed, at this point, to the ventilatin medium. Y t

Inasml h as no upper half-frame is provided, the stator 2 is uncovered, and the end portions of the machine are enveloped by means of a plurality of inclosing casin 75 and 76 winch may conveniently be 'ma e of sheet material and which are' suitably secured to'the end plates 33 of the stator 2 and to the-end portions of the lower halfframe 1. 4 l

Assuming the phase converter ,to be in operation and a 'Ventilating iiuid or medium from a suitable source to be introduced through the respectiveend inlet openings 20 and 21 of the frame 1, a considerable rcs- Vsure Vis produced in the inclosed end c ambers 78 and 7 9 of the machine. A circula tion of cooling fluid is, therefore, inwardly through the longitudinal ducts 36 and 66 of the stator'2 and rotor 3, respec tively, into the intermediate space provided between their respective" component halfunits, from whence it is dischar d past the exposed conductors 53 and 72 ina radial direction, either through the discharge openings 22 or directly to the surrounding atmosphere. I v

By reason of the emdployment of the cen- 42 an spaces between the vstator and rotor units are divided in such manner that the 69, the intennediate o ositely flowing streams of'V Ventilating uid Ythrong Y the'longlitudinal Yductsare maintainedentirely in ependent and sepamate, and do not react, theone upon the other, to obstruct thejfree flow, by creating back pressures. inasmuch as the lengths of the core halffiinits are. comparatively short, the cooling medium is particularly elective, even/'in proximity to the inner portions thereof.

Attention is now directed to the construction of the starting motor in which the projecting end portion 11 of the lower halfframe 1 is provided with 'a semi-c lindrieal seat S0 which is co-axiall relat with respect to the other cylin rical seats 14, Y1'? and 18 of the frame 1. Al already exing . brac et 93 which is forced half- (aiv the outer end thereof is in substantial alinement with the outer surface 85 of a downwardly projecting ange 86 which is provided with an annular 1p 87.

The starting motor rotor 5 embodies a laminated core structure 88 and a commutator c linder 89 which are assembled upon a suita le s ider 90 in any well-known manner. The s aft 6 projects beyond the bearmember 8, and its projecting end 6 is tapered to receive the spider 90 that carries the starting motor rotor, said spider being driven or pressed upon the tapered shaft in the same manner as pinions are customarily positioned. A key 91 serves to prevent relative movement between the shaft 6 and the spider 90 and a screw-threaded upon the end of the shaft to lock the spider in position.

Secured to the semi-annular {iange 86 of the rejecting frame portion 11, is an end rovided with a corresponding semi-annu ar liange 94 that engages the outer surface 85 of the flange 86 and rests upon the lip 8'?, and, at the same time, engages the outer end of the stator 4 and thus retains the stator in position. pluralit of bolts 95 secures the bracket 93 to the ange 86.A The end bracket or bell 93 further embodies an outer ring or annular supporting member 96 which is concentrical y disposed with respect to the shaft 6 and serves to support a plurality of brush-holders or sets of brushes 97 that coperatively enga e the commutator cylinder 89 in the usua manner. An inclosing casing 99, preferably of sheet material, is associated with the upper half of the stator 4 and embodies a pro1ecting portion 99' that covers the rear end of the startin motor, and `another projecting portion 9 b which envelo s the commutator end thereof and is suitab y secured to the brush-supporting rirg 96.

y reason of the arrangement of parts of the starting motor, the stator 4 and the rotor 5 ma be inde endentl removed after having ismantle the ,endY bracket 93, without disturbing, in any Way, th'e assembly of the hase-converter parts. For instance, having dismantled the end bracket 93, the stator 4 may bc removed longitudinally, or, after removing the lock-nut 92, the rotor 5 may he withdrawn from the tapered end 6 of the shaft 6. Y Inasmuch es the lower1 half-frame 1 is a single unitary member and serves in common nut 92 is combination with stationary; y y means and a plurality nrotatable magncftlzlj to support the parts of both the hase con"- verter and its starting motor, tie severall reason of the cmnbinntion of the phase con- A verter and starting motor frames into a single unit only, a pair of bearing members and H is required and the starting motor muy be conveniently overhang, thereby minimizing the number'of parts, reducing the 'weight and securing al compactness of construction that would otherwise be impossible.

Although we have, for illustrative purposes, shown. and described/a structure of more or less specific structura details and arrangement and location of parts, it is obvious that certain of the advantages and benefits of our invention may be derived from apparatus differing somewhat in its structural features, and, therefore, We desire that only such limitations shal lbe imposed as are indicated in the appended claims.

lVe claim as our invention:

1. In a dynamo-electric machine, the combination with stationary magnetizabie means and a plurality of rotatable magnctzable members disposed in side-by-side relation and spaced apart and havin longitudinal Ventilating ducts, of a bai'e p ate interposed between said members and rigidly secured in position, and means for permitting' a circulation of Ventilating air from the respective ends of said machine through said longitudinal ducts into the space intermediate the m etizable members.

2. In a ynamc-electric machine, the combination with stationary magnetizable means and a plurality of com lete and independent rotatable magnetiza le members disposed in sidebyside relation and spaced apart, and res ctively provided with longitudinal Ventilating ducts, of means for permitting a circulation of ventilatin medium from the res tive ends of sai machine through sai longitudinal ducts into the spaces intermediate the core members from whicheit is radially discharged, and a baille plate interposed between said core members.

3. In a., dynamo-electric nnnehine,` gie,

able members disposed in side-by-side relation and spaced apart, and having iongltudinal Ventilating ducts, of means for permittn a circulation of Ventilating medium inwar ly through said ducts from the respective ends of the machine, and means disposed in the space between said rotatable magnetizable members for defiecting the circulated Ventilating medium and discharging it outwardly in a, radial direction.

4. In a dynamo-electric machine, the combination with stationary magnetizable means and a plurality of rotatable magneti able members disposed in side-by-side vrelation and spaced a aart, and having longitudinal Ventilating ducts, of a common squirrel-cage windin disposed in slots on the periphery of sai magnetizable members and ridging the intermediate space, and means for permitting a circulation of Ventilating medium from therespective ends of the machine through said longitudinal ducts and into the intermediate space from whence lit is disharged radially past the bridging squirrel-cage winding.

5. In a dynamo-electric machine, the combination with a two-part Vstationary ma netizable member, of a two-part rotatab e Inagnetizable member in operative relation thereto, the parts of both magnetizable mem bers being separated by an intermediate space and being provided with longitudinal Ventilating ducts, and means for permitting the circulation of a ventilatin medium from the respective ends of sai machine in- 'wardly through the ducts` of both of said magnetizable members into the intermediate spaces between the component parts thereof.

6. In a dynamo-electric machine, the combination with a twoart stationary magnetizable member, an a two-part rotatable magnetizable member in operative relation thereto, the parts of both magnetizabie members being separated by intermediate spaces and being provided with lon itudnal ventilating ducts, of annular bal-l e plates interposed 1n the s aces between the parts of the stationary an rotatable magnetlzabie mem- 'bers respectively, and means for emitting a circulation of Ventilating medium from the respective ends of said machine through the 1Ventilating ducts of both the stationary and rotatable magnetzable members into the intennediate spaces between the parts thereof.

7. In a dynamo-electric machine, the combination Wlth a complete frame comprising only lower halffrarne portions having a plurality of unitary semi-cylindrical seats therein, of a plurality of cylindrical magnetizable cores disposed in side-by-side relation upon each of said seats and means for' securing said cores rigidly to said frame.

g 8,., Innanzil .namgelectric machine, the comseats, a

im# A e i n i :an: f E v erat g uw. "ve and by said bearing memwith said frame for inclesin'g'xe respective v bersandtaperod at the end corresponding to 7o ro lindned sent e 4 oi I is the frame for inelosing the upper upper half end portions of said machine. thecere member o leia'metcr, a rotatable 9. In a dynmno-electrie machine, thecome.. :.-.izab1 ecore member :mounted upon bination with a frame comprising onlya sai shaft thefbearing memlower half-frame havi a semifcyf bers,`andarotatab1e magnetizable core meini 4 of'eas diameterhavingetapcred it with 75 y l A. Y

` D v k J :7,' Ent s l with the respective stationary x an i tetable magnetizable member-an supporting tions of said machine. y .body'in anlintegral `projection'end orton, 10. In a dynamo-electric machine, the comand as aft rotatably' mounted in sai frame bination with a lowerhal Vframe hav a and projectingfbeyond itin coperative resemi-cylindricalseat, apluralityo end et lation to saidpr'ojccting end portion ofsaid ventilating openings and central frame; of 'a stationary magnetizahlemember e5 outlet ventilating e of tu? nrality of supported rtion pond a ro-Y uneovered Y magnetiztatable nnatgnetf` rremovablyi die. able oore members irmgfiitndinniven#r 'of .Suid shgft tilating ducts said seat and sepa-' .in-co veY atlontothesaidstationary rated to provide anmtermediate spacecom--` z 'neiixbelz p no municating with said. centraigventilating 5115. 'Theoombination with @will dynamoopenin a plurality of members eo 'ratelectric machine embodyirga: supporting ingwit sai stationary members, an said ramehav'ing fa semi-cyl'm rical projecting I `frame for inclosng the upper endvportions end portion, ,a bearing member intermediate 3o of said machine, and a pinrality of rotatable the projectin end portion'of the iframe and 95 core members havinglongitudinal ventilatthe L, thereof, and a shaft-.carried ing ducts and separated to provide an inter- Vinpartjby sai bearing member and projectmediate spa-,ce mm f ting with the space.l ing be-ondtbe bearing member in coperabetwecn core members and Y'-,trive 'fnwith he projecting end portion the central dischargeopenings. il tikaf-graine, bf'a'stationaryzma etizableloo 11. In a dynamo-electric machine structure, memberfgseatedlin said semi-cyln ricai prothe combination with a `lower.' 'half-ntimo:` jectn and Aadalated to belongitndihaving a lurality of co-axialcylindrical "Inally'reioved therefrom, and. a rotatable seats of di erent diameters, of a.v lumdity of f magnetieable member mounted n n the pro- 40 uncovered stationary cylindrical. 1magnetrr'--jectin of said shaft an removable "105 able cores of. 'corresponding f diameters Vfthere ",mTin' alongitndinalidirection: adapted to rest uponthe respective seats.l 1 1.6. Ill-a dynamo-electric machinetheeom 1 2. In adynamoelectriemachinentmdiure, '1*bination" with a supporting frame a the combination with a lower,harame l 'semij-cylindricalseat therein, afstationary cyhaving a pluralitym' co-axal cal seats of diierent wv-.7 and .a plurality,M-,seatfandsremovable-therefrom ini a? of co-axial bearing member yseats-|21@ afpufjfieeitudinal "'liltinj means pming rality of uncovered stationa` cyhndricai "wit saidrameand said ma etizab1emem magnetizable core members o `correspon hers-iorretainingsaid mem r in position `50 ing diameter adapted to rest upenfthe 'reanda' shaft snppomdat one 'end of sai 115 spectiveseats'of dlierent diameters, hearing frame, ofya .rotat'ebe-y magnetizable core members disposed insaid heangmea'iber member seciiredtothe free'end .of said shaft seats, a shaft carried by said bearmg'mem# andedaptedgto he removed therefrom' in a bers, and a lnralityiof rntatabie,cylindricalV 'lo tndinai direction, f n

magnetzab e eoremembers of different sizes' I' nfaynamo-electric machine',I the com- 120 mounted upon sa'd shaft in operativereiairintinn |n, drame comprising only a". tion to the respective stationary core memlower'hai'member having a siem'i'cy1indri-A bers of diii'erent diameters. i cai seat, a plnraity of 'and Ventilating open- 13. In adynamolectric machine structure, ings and a row of centrally located ventilatthe combination with a lower haii-frame ing openings, of a plurality of spaced cylin 1.25

having a luralit of co-axal cyindrical idrieai mgnetizable cores disposed in sidets of di erent iameters and a plurality by-side relation upon said seat; the space beo co-axial bearing member seats, of a plutween said cores communicating with said rality of uncovered stationary cylindrica central.ventilating-openmgs in said frame. magnetizable core members of corresponding 18. In a dynamo'- ectric machine, the com- 130 d porfremelforztheistationry member andi emso i bination with a frame com rising only n lower half member provide with semi-annular end portions :md Ia Semi-cylindrical wat intm'mmlintv said ond portions, of a, plurality of cylindrical] nmglwtlzble cores disposed in sdc-by-sde relai-inn upon said sont :ml wtwvvn sand vnd portons'and means for securing said cores to said seat.

In tegtimony whareof, we have hereunto subscribed our names this 19th day of March, 10

RUDOLF E. H ELLMUN D. JOHN V. DOBSUN. Witnesses:

W. A. CLARK, B. B. HINES. 

